This.  very much this.  If the config from the ultracoin site launches on your card, you will not get HW errors unless you're using drivers beyond 13.12. 

Best GPU for the money for mining YAC is still the R7 240 4GB sapphire card.  $70 card nets 365 -370 Hash/sec, and works perfectly fine with 1x risers.

As for how much one is making in a day, right now is _not_ a good time to determine that - the difficulty is still adjusting to the new network hashrate and hasn't hit its equilibrium value yet - look for it to hit ~90-100.